Improvement in steam-valves for pumping-engines



J. TREGONING. STEAM-VALVES FOR PUMPING-ENGINES.

No. 193,736, Patenlted July 31,1877.

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N- PEIERS, FHOTO-UTHOGRAPHER. WASHINGTON. D O

UNITED STATES JOHN TREGONING, 0F BROOKLYN, NEW YORK.

IMPROVEMENT IN STEAM- VALVES FOR PUMPING-ENGINES.

Specification forming part of Letters Patent No. 193,736, dated July 31,1877; application filed June 11, 1877.

. of New York, have invented a new and Improved Valve forPumping-Engine, of which the following is a specification Figure 1 is alongitudinal section of a steamcylinder of a iumping-engine containingmy improvement. Fig. 2 is an end elevation.

Similar letters of reference indicate corresponding parts.

My invention relates to a novel method of operating the valves in steampumping-engines and it consists in a circumferentiallygroovedpiston-rod, which acts as a valve, and in passages that lead from theends of the valve-chest to and across the cylintlerlieads, and to theexhaust-receiver of the cylinder, the said passages being crossedbetween the valve-chest and cylinder-heads.

Referring to the drawing, A is a steamcylinder, containing the piston B,which is secured to a piston rod, 0, that extends through both heads ofthe cylinder. At the top of this cylinder there is a cylindrical valvechest, D, containingthe valve E, which is placed within and moved by thepiston F.

The valve E is similar to an ordinary D- valve, and when moved back andforth in its chest it admits steam to and exhausts it from the cylinderA in the usual way.

Ports G are made in the side of the valvechest, and connected withtransverse passages a in the cylinder-heads by the crossed passages b,which are shown in dotted lines. The passages a, lead through theopening in the cylinder-heads, through which the piston-rod and over thevalve E. When the piston arrives at the end of its stroke, the groove 0in the piston-rod coincides with the passage a in the cylinder-head, andsteam escapes, through the exposed port G, passage b, and passage a, tothe exhaust-receiver H, when the steam that leaks by the piston F drivesit, together with the valve E, to the opposite end of the valvechest,and shifts the steam in the cylinder A, so that the piston B ispropelled toward the opposite end of the cylinder, and the steam isexhausted from the valvechest in the same manner as before described.

Having thus fully described my invention, 1 claim as new and desire tosecure by Letters Patent The combination of the oircumferentiallygroovedpiston-rod O, and the cylinder having passages to b, with thesteam-chest and the valve E, as and for the purpose set forth.

JOHN TREGONING.

Witnesses:

G. SEDGWIOK, LEX. F. ROBERTS.

